In the spring, lock head north to their reproduction grounds, and also in the fall, lock head south to overwintering locations that room warmer and also have ample food supplies.
You are watching: Why do birds have hollow bones
Migration can be a long and hard journey, and the enlarge the bird, the more difficult it seems the journey would certainly be as the bird has to keep its hefty body flying together a distance.
However, birds have actually a unique bone structure that renders flying and the rigors the migration easier for lock --- hollow bones!
A person bone is dense and filled with bone marrow. However, a bird bone is hollow and also filled through air. It additionally has some cross-sections of bone, dubbed struts, that make the bone strong and help birds withstand taking off, flying and landing.
One would certainly think that having actually hollow bones would make a bird"s skeleton lighter than a mammal"s, however research has shown that a bird"s skeleton actually weighs about the very same as the of a mammal. However, the hollow, dense bone is in reality stiffer and stronger 보다 a mammal"s, make it host up come the pressure and rigors that flight.
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